Spark-arrester



D. G. McDOUGALL.

SPARK ARRESTER.

APPLICATION FILED IuLY I2. I9I9.

Patented Mar. 9,1920.

fie'.

INVEN TOR.

BY l.

ATTORNEY.

WI TNESSES n. G. MCDGUGALL.

SHARK ARRESTER.

APPLlCATON FILED yJLILV l2, `1919.

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Specification of` Letters Patent.

Appneauonvnlea'my 12, 191'9. serialA No. 310,450.

'Todi/whom #may concern VBe itknown thatI, DONALD G. MCD 3UGA I.I..,`l asubject ofthe King of England,iresid1ng at Ipswich, in the State of Queensland, and

5 country of Australia, yhave invented certain new and useful Improvements 'in `Spark- Arresters, ofA which the following isvv a specification.

"The invention relates to means fire.

'The invention provides s ark arresting means particularly adapted or locomotives which' will notfmaterially interfere with Vtheforced draft which is essential to maintain ahQt fire for the quiekl generation of steam.

VThe"drawings illustrate a preferred emto`- bey understood that. in adapting lthe same to meetdifferent conditions,` various changes inthe form, proportion, and minor details.

of construction may beresorted to without departing from the nature of the inventio as'claimed hereinafter. In the draw-ings hereto attached, I Figure 1 isa'l'ongitudinal section of the forward portion of a locomotive boiler prof vided with spark arresting means embodyling the invention. Y

Fig.`2'` is, a transverse section on theline- 2-2 of Fig. l looking to the rear.

Fig. 3 is a horizont rl sectionon a-aof Fig. 1, Y p y y.

Figs. land 5 are detail viewsl of the portion of the'perforatedbaflie plates. y

Corresponding and likefparts are referred to in the following description andindicatedy inithese'veral views ofthe drawings by like reference characters;

' The'drawings illustratethe application of thefinvention to alocomotive. boiler of ordivHue plate andB ythe smoke boX` at the forward end of the boiler, the same being mounted upon-the saddle 4 of the engine and having-4 -thesmoke stack 5 connected thereto. Achuteisconnectedv withthe lower forward portion of theY smoke box and `comprises a funnel-shaped'{'orti'on` (il andV a tubular portion' T-,saidchute beingI closed at its lower endby meansfof'` ay swinging cover 8I which is held in closed position by a weighted arm 9% Vvsuitable connection 1t) L'isf attached =to for -pre-l venting the escape of sparks and incandes-` Cent'particles which yhas proven dangerous l in causing out-buildings and kfields totake bodiment-'of the invention. However', itis line naryV construction, theV numerall designating theA body; of the boiler, the numeral Qian end they weighted arm 9 and extendsinto' the cabf of the locomotive or to other'` convenient position to be operated when it is required to swing the cover 8` intoopen position to ad, mit of ashes and like accunnilations4 escaping-'from the chute. `A pipe 11 connects with, the lowerpo'rtion of the chute nearV they out#V let thereof; and.y supplie'sga medium yfor positively clearing'the ashes; or otherl a'ecuiin'lla-l open. The pipe 1'1` preferably connects with the water Space ofthe boiler and i'sprovided with a Vcontrolling valve`12 which"V is 'adaptedf tov be opened or closedl by vthe engineer. When thev cover 8is.y open and" water" from the 'boiler permitted to-discharge into the chute the 'accumulation in the' latter isf quickly and thoroughly di'scharggged.l

` Thenumeral designates 'the branch# pipes-by means of which the steam isl conveyed from'fthe boilerto the "side cylinders, notfshown, ofthe engine in avmannerwell' understood. Said branch pipes connect"withl the main pipe ln'which is in communica-- Patented Mar. 9,1920;`

y tions ,from VtheWchut-e 'when vthe coverv l8 is tion lwith' the steam space4 or dome 'of the,v

boiler in a manner well" understood. TheV numeral 15 indicates the ordinary blast pipe which receives theeXhaust from the `cylin' ders of the engine. The blast'pip'e 15 is in"V line with the smoke stack. 5' and terminates.v in a nozzle 16. A funnel-shaped screen 17' connects the delivery end ofthe blast pipejwith the'lower or receiving end of thev smoke stack and serves to "prevent the escape of any sparks rwhich may reach the screen.V i

` A plurality of baffle plates vis disposedv within the smoke box.. These'plate's are ar,l

ranged substantially, as indicatedl in Fig. l

and are supported by the sidewalls.` of-` the smoke boxl preferably by' means of `angle irons 18.V Obviously 'the plates maybe supported in any desired way. The plates. may be of unitary or sectional' formation asfl vfound most advantageous toadmit of'access to the parts forrepairs'or any Vother purpose. Beginning at thefrontend'of the' smoke box the balile plates are designated successively bythe letters A, B, C, D andfE;

Thel ybaffle plate Al isl'ocatedv near'fthe topA ofthe smoke boX- `and' inclinesrearwardly,1y

and downwardly and'Y-"is imperforate. Thev baffle plate B is inclined', slightly tothe ver? ticala'nd" has its upper ed-ge'in- Contactwithl or-f lioini-ngthe-lower reared e of: 'the bafie plate A. The baiiie plate@y is p/effrtdr man irenes.-faevmwa'rui-yu ands raam-.truly Y from its upper forward edge. The baille plate C is perforated and inclines downwardly and rearwardly from the lower edge of the baffle plate D and terminates a short distance from the bottom of the smoke box substantially, as indicatedv in the detail views, Figs. 4 and 5, the body of the plate be- .ing designated by the letter B and the openings therein by the letter b. The openings b are countersunk to facilitate the passage of and about in line with the blast pipe 15. tliproducts of combustion and the escape of The4 baffle plates B and C are of sectional formation and the middle sections are hinged to admit of their being turned aside when it is'required to gain access to the interior of the smoke box for any purpose through the front thereofwhich is closed by a cover 19 in a manner well understood. The balie plate D is imperforate and is relatively narf row and isV disposed a short distance from the bottom of the smoke box Vand has the front edge in close contact with the lower edge of the baffle plate C. The baliie `plate B inclines slightly to the horizontal in an upward and rearward direction from its juncture with the baffle plate C. The baffle plate E is likewise imperforate and inclines upy wardly and rearwardly from its lower edge which makes a close joint with the rear edge of the bae plate B.y The baliie plate E is of sectional formation and the middle sec-l tion is hinged at its upper edge, as indicated at e to admit of such section being movedv aside when access to the Hue plate 2 is required. A plate 20 secured to the flue plate 2 extends horizontally therefrom and makes close connection with the upper edge of the baffle plate E. The baffle plates C and E incline upwardly in opposite direction with y thrown downward into the lower portion'of the smoke box and is swept forwardlyby the current into the funnel portion 6 of the ash chute. As the products of combustion reach the lower portion of the battle plate E they are directed forwardly and downwardly by the baffle plate D and are caused to sweep across the lower portion of the smoke box and thence upwardly at the front end thereof when they meet the imperforate baffle plate A and are again deflected rearwardly and downwardly, Any sparks or incandescent particles striking the baffle plate A are deflected downwardly into the lower portion of the smoke box whereas the prodvucts of combustion pass through the open- Y traces of sparks to prevent the escape of the "same into the open air.

" TThe baffle plates B and C are constructed any ashes that may tend to accumulate aboveY baflle plates B and C swung to. one side and; the middle section of the baffle plate E either turned aside or removed, the latter result being` attained by having hooks at the upper edge of the middle section engaging openings in an angle iron 21 at the forward edge of the plate 20. Suitable fastening means are provided for securing the movable sec-y tions ofthe baiiie plates, dicated at 22.

The foregoing descriptionand the-'dra'w-l ings have referenceto ywhat `may be Vconsidered the preferred, or approved form of my' invention. It is to be understood that may make such changes `in construction and ar rangement and combination of parts, ma-i terials, dimensions, et cetera, as may prove expedient and fall within the scope of the appended claims. l l

Having thus fully described my invention, what I claim as new and desire to secure by LettersA Patent is Y,

1. In a steam boiler provided with a smoke box, a depending baffle plate at the inner or rear end of the smoke box and an upwardly and forwardly inclined perforate baffle plate in the forward portion of the smoke box and havmg close connection at its lower edge t with the lower portion of the depending baffle plate and having close connection at its upper forward edge with the front of the smoke box.v

the same being in- 2. In a steam boiler providedwith a smoke*V I box, a depending imperforate baffle plate in the rear portion of the smoke box, an imperforate baffle platein the upper forward portion of the smoke box and a downwardly" and rearwardly 'inclined perforate baflleplate between thel two imperforateV baffle plates. l

3. In a steam boiler provided with a smokeY` box, a plurality of baffle plates disposed within'the smoke box and extending transversely thereof and arranged= at various angles, the intermediate baille plates including movable sections to facilitate `access toA the interior of the smoke box for any de-l sired purpose.v

In a steam boiler'provided with a smoke box, a downwardly and forwardlyinelined.

ilnperforate baille plate n the rear portion of the smoke box, a forwardly and downwardly inclined baille plate in the lower portion of the smoke box having close connes#- of the second mentioned baille plate and other v baffle plates .interposed between the upper portion of the perforate baille plates and the front of the smoke box.

5, In a steam boiler provided with a smoke box, said smoke box having a smoke stack and a blast pipe in line with each other and a screen between the delivery end of the blast pipe and the receiving end of the smoke` l stack, a baille plate in the lowery portion of the smoke box in line with the blast pipe and inolining slightly to the horizontal in an up ward and rearward direction, van imperforatebaille plate inclining upwardly andA rearwardly from the rear portion of the aforesaid baille plate, a perforate baille plate inclining upwardly and forwardly from the forward edge ofthe first mentioned baille plate and other baffle plates between the upper forward edge of the perforate baffle plate and the front of the smoke box.

In testimony whereof I affix my signature in presence of two witnesses.

DONALD Gr; MCDOUGALL. Witnesses:

WILLIAM F.' LALoR, EDW. W. DE REINDERE. 

